HN's search is hosted on Algolia, and is not a part of the HN "App".

Hacker news is not a SPA.

Algolia's search is a SPA, but is perfectly utilizes the search so you can refresh a page (besides the error that they don't use page-based search), and is largely indistinguishable from a non-SPA site.

> You can load entire HN

You obviously have not context what so ever on how much content is hosted on HN.

Yes, I am well aware it is separate from HN. That is why I called it HN's search page.

You underestimate how fast modern internet is. With MPA website like HN there is no need to wait for any script to render first.